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Small speed improvement by storing variables separately (rather than in Vector3D) to void construction/comparison overhead.

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David Williams
2015-03-09 23:52:56 +01:00
parent 99d0a226c8
commit 741234e4a5
2 changed files with 20 additions and 6 deletions
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12
include/PolyVox/PagedVolume.h
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@@ -283,11 +283,19 @@ namespace PolyVox
private:
Chunk* getChunk(int32_t uChunkX, int32_t uChunkY, int32_t uChunkZ) const;
// Storing these properties individually has proved to be faster than keeping
// them in a Vector3DInt32 as it avoids constructions and comparison overheads.
// They are also at the start of the class in the hope that they will be pulled
// into cache - I've got no idea if this actually makes a difference.
mutable int32_t m_v3dLastAccessedChunkX = 0;
mutable int32_t m_v3dLastAccessedChunkY = 0;
mutable int32_t m_v3dLastAccessedChunkZ = 0;
mutable Chunk* m_pLastAccessedChunk = nullptr;
mutable std::unordered_map<Vector3DInt32, std::unique_ptr< Chunk > > m_mapChunks;
mutable uint32_t m_uTimestamper = 0;
mutable Vector3DInt32 m_v3dLastAccessedChunkPos = Vector3DInt32(0, 0, 0); //There are no invalid positions, but initially the m_pLastAccessedChunk pointer will be null
mutable Chunk* m_pLastAccessedChunk = nullptr;
uint32_t m_uChunkCountLimit = 0;
// The size of the volume